. >> just got this new video in of president obama and his family taking a bike ride on martha's vineyard earlier today. good to see both of them wearing their helmets there. the family, first family scheduled to leave sunday. those are just a few of the things we thought you should know. time for the "news nation" gut check. it has long been the subject of wild conspiracy theories about ufos, extra terrestrials, alien autopsies, and lots more. newly released cia documents officially confirm a site in the nevada desert known as area 51 does actually exist. so exactly what does the government say was happening there? here's nbc's mara schiavocampo. >> reporter: conspiracy theory confirmed. the u.s. government has finally recognized the existence of area 51. according to recently declassified documents obtained by the national security archive at george washington university, the military air base is 125 miles northwest of las vegas. until now, it never officially existed, with all references to the area redacted from government files. >> they're no longer pretending the place doesn't exist